Guys, what does "just give me some space" mean?

Nothings wrong that I know of. I haven't cheated on him. We didn't have a fight. I'm not mean to him. Hell a couple of days ago we were drinking with some friends together. He is going off to bootcamp in a couple of months and my friend said it sounds like he's scared and doesn't want to be attached to someone when he goes. Help?
Guys, what does "just give me some space" mean?
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